what has the crime got to do with Bitcoin ?
All of the things Backpage uses to accomplish their deeds, including the schemes put in place to exchange money,
have to do with it. Bitcoin is used by Backpage, at least partly, because of its unique attributes to advance the crime of child sex trafficking. Just like Silk Road which could not exist without a payment scheme that had these interesting aspects such as easy transmission on communications networks, BackPage exists at least to some extent because bitcoin permits the exchange of money on channels that cannot easily be closed. Visa and MasterCard stopped their payment channels under pressure from some fucking cop. But this can't be done with a network like bitcoin. Therefore, it has a lot, a whole fucking bunch to do with bitcoin.